66523030243 has 4 divisors (see below), whose sum is σ = 66788062488. Its totient is φ = 66257998000.

The previous prime is 66523030199. The next prime is 66523030267. The reversal of 66523030243 is 34203032566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66523030243 is a prime.

It is a super-2 number, since 2×66523030243² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66523030199 and 66523030208.

It is not an unprimeable number, because it can be changed into a prime (66523031243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132515746 + ... + 132516247.

It is an arithmetic number, because the mean of its divisors is an integer number (16697015622).

Almost surely, 2^66523030243 is an apocalyptic number.

66523030243 is a deficient number, since it is larger than the sum of its proper divisors (265032245).

66523030243 is a wasteful number, since it uses less digits than its factorization.

66523030243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265032244.

The product of its (nonzero) digits is 77760, while the sum is 34.

The spelling of 66523030243 in words is "sixty-six billion, five hundred twenty-three million, thirty thousand, two hundred forty-three".